Two step knife sharpener



FIG. 1 is a front perspective view of the ornamental design for two step knife sharpener of the invention;

FIG. 2 is a front elevational view, of the ornamental design for two step knife sharpener of FIG. 1;

FIG. 3 is a top plan view of the ornamental design for two step knife sharpener of FIG. 1;

FIG. 4 is a bottom plan view of the ornamental design for two step knife sharpener of FIG. 1; and,

FIG. 5 is a side elevational view of the ornamental design for two step knife sharpener FIG. 1, with the opposite side being the mirror image of FIG. 5. 

The ornamental design for a two step knife sharpener, as shown and described. 